Galvanizing apparatus.



A. NIBDRINGHAUS.

GALVANIZING APPARATUS.

APPLIOATION FILED 1320.13, 1909.

atented Sept. 6, 19M).

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.ALEXANDER NIEDRINGHAUS, OF ST. LOUIS, MISSOURI.

GALVANIZING APPARATUS.

Specification of Letters Patent.

Patented Sept. ti, 19M).

Original application filed March 11, 1909, Serial No. 482,769. Divided and this application tiled December 13, 1909. Serial No. 532,913. i

To all whom it may concern:

Be it known that l. nnxxxonn ncomxonxi's. a citizen of the United States. residing` at St.- Louis, Missouri. have invented a certain new and useful lnnnorcment in (lralvauizing Apparatus, ot' which the fob lowing` is a full. clear` and exact description, such as will enable others skilled in the art to which it appertains to make and use the same. reference bein;r had to the zu'com'pan ving` drawings. forunmgr part ot this specitication. in which- Figure l is a longitudinal sectional view through my improved galvanizing apparatus, Fig. 2 is a detailed View of the lower end of the flux box before it introduced into position. Fig. 3 is`a detailed View o t' the lower end of the galvanizing box before it is introduced into position.

This invention relates to a new and useful improvement in galranizing apparatus. I

ln the galvanizingr of plates wher(l molten -lead is used in the bath, a tlux box is also used, through which l'lux box the sheet to be galvanized is passed prior to its introduction into the molten lead bath. Great difficulty has been experienced in the use of these flux boxes because the metal of which they are composed burns out at the lower portion, or is eaten away so4 that spelter and dross enter and the tiux escapes into the kettle. The boxes, therefore, have to be frequently renewed. In introducing a new box into position, the lower open end of the box will trap a quantity ,of spelter and dross, which in practice has had to be ladled out after the box was submerged in position. It has been found to be impossible, however, to ladle ont all of the spelter and dross. -The object of the fdlux'box in excludinte the spelter and dross is to enable the sheet, after passing' through the tiux box, to be tirst treated in the lead bath where -it is heated to the proper temperature and thus made in readiness to receive the coating of zinc which more readily adheres to the heated plate, and the plate being of an even. temperature throughout, will partake of an even coating of zinc.

My present invention consists in the provision in a fiux box of means to exclude spelter and dross in submerging, or partially submerging this box in position. This 4means in the present inst-ance consists of a breakable bottom wall made of somev frangibilel material such as cement or plaster-ofparis` so that it may be broken when the box is inserted in position to permit the introduction of molten lead into the lower end .thereof to the exelusion of dross and spelter. in the instance. of the tlux box, "and to the exclusion ot" dross 1u the instance of the box at the discharge end of the tank.

This present application is a division ot' an application tiled by me on or about March llth. 190), seriallyv uiunberod 482.769.

l indicates the walls ofthe kettle or tank. around which is a space 2 for the fuel, said fuel burning` between the walls l and brick walls 3. v

-t and 5 are the feed rolls between which the sheets pass in entering the kettle, said sheets strikiirr` detiecting finger and being; guided down.into and through the tlux box T. This tlux box. as shown in Figs. l and L). is niade ot' sheet metal and'suspended from the walls of the tank. The box is open at its top and bottoni, thevupper cud projecting above the surface of the niolleu spelter and theI lower end of the box projecting,` below the surface ot' the molten lead bath. In this box is arranged the tluxing material through which the sheet to begalvanized passes on its way to the molten lead bath, which molten lead bath heats the sheet preparatory to its contact with the molten zinc, which latter material adheres to the surface lof the sheet, forming a skin or coat thereon, theI sheet passing through squeezing rollers 8 and t) as it issues from the kettle. Beyoud, the kettle sheet is bent over by guide fingers 10 on to the conveyer chain 1l, on which chain it is permitted to cool.

It is quite important at the finishing stage to have the dross excluded from the box 12,

atthe dischargeend of the tank and the box 1Q therefore bridges the dross, its lower end being` submerged iu the molten lead bath and its ,upper emtterminating under the rollers ,8 and 9 and below the upper surface of the spelter bath. The spclter bath can thus overflowrinto the box l2 and keep it. lilled at all times. The dross is an objectionabie element inv galvanizing. may be impurities in the spelter which drop to the bottom, or impurities in the lead which flow to the top. 4

As the spelter is used, it is replenished by adding spelter, which melts and overiows intothe box l2. The lead, of course, may be These substances replenished in the saine way by adding of my device can be made and substituted metallic lead when needed. l'he dross may accumulate and till up between the lead and spelter to the top of the box l2, the box l2 excluding the dross troni the sheets. Should the dross get on the sheet it will leave lumps, which are objectionable. As the dross builds up, 1t is preterable to remove it by ladling it out, or it can be piled in the center until convenient to remove it so as to float upon the surface of the lead between the tiux and gal'anizing boxsf l have used the terni galvanizing box in referring to the box 12, tor the reason that it is Within this box that the sheet to be gab vanized receivesl its coating of nine or spelter.

13 represent guiding bars which guide plate to be galvanized through the nmol lead bath. 'ln soule ltettles rollers are userV Referring` to fl"ig. 2, lower end "l' the tlux box T.

tbl it:

l5 is a similar plug in thc lower end oit boX l2. This plug preferably plaster ot paris, -which held in position b y the walls ot the. box T which are grooved or by keysor ribs, as shown in 'box l2, and the plug east therein.

In preparing the flux box to be introduced into igmsition iu the kettle, the plug i'I signature 1n the presence ot two witnesses,

arrange..1 in place, and the box placed in the kettle., lt the plug is of plaster of paris, or other frangible i derial, it niay lug-flanken, and particles rfi Moat on the surtaee ot the lead.

I am aware 'that tion and arrang changes in the construcfit oi the several parts lst is a plug` in the 1 spetter, a linx box Vwhose upper end extends the surface without in the least departing troni the nature and vprinciple of vniy invention.

Having thus described my invention, what l claim is:

l. ln a galvanizing apparatus, a flux box havingr a frangible plug in its bottoni.

2. ln a galvanizing apparatus, a flux box haring a breakable plug in 3 bottoni.

3. ln a galvanizing apparatus7 a galvaniz ing box at the discharge end of the tank having a brealrable plug in its bottoni.

el. In a galvanizing apparatus, a kettle having a stratified spelter and lead bath in combination with a box having its bottom opening into the lead bath and its top into a spelter bath, said box bridging' the space occupied by the dross, and a brealiable plug in the bottom ot' the box.

ln a galvanixing apparatus, a kettle laring a bath composed ot' inolten lead and above the surface ot the lead, and breakable plug whose upper end extends above ot' the spelter and Whose lower end extends beneath the surface ot the lead, and a breakable plug in the bottoni of said box.

ln testimony whereof l hereunto alix iny 

